Alert archive / Vermont / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 33, NWS Burlington, VT

July 20, 202111 counties in Vermont; Essex County, New York

NWS Burlington, VT issued this severe thunderstorm warning at Jul 20, 2021, 7:32 PM EDT for 11 counties in Vermont; Essex County, New York. It was in force for 58 min. 3 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 20, 2021, 7:32 PM EDT (23:32 UTC)
Expired: Jul 20, 2021, 8:30 PM EDT
In force: 58 min
Issued by: NWS Burlington, VT
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Essex County, NY, Addison County, VT, Caledonia County, VT, Chittenden County, VT, Essex County, VT, Franklin County, VT, Lamoille County, VT, Orange County, VT, Orleans County, VT, Rutland County, VT, Washington County, VT, Windsor County, VT

The radar

The Burlington radar (KCXX), 75 km from the middle of the area, began a volume at 23:31 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Jul 20, 7:34 PM EDT	TSTM WND DMG	Lincoln, VT	SEVERAL TREES AND POWERLINES DOWN.
Jul 20, 7:50 PM EDT	TSTM WND DMG	Waitsfield, VT	TREES ON ROAD AND POWERLINES. TIME ESTIMATED.
Jul 20, 7:58 PM EDT	TSTM WND DMG	Roxbury, VT	TREES AND POWERLINES DOWN ON MULTIPLE ROADS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 20, 3:05 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Gray, ME (KGYX), launched 12:00Z, 11.5 hours before the alert went out and 167 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 205 J/kg
Mixed-layer CIN: -63 J/kg
Mixed-layer LCL: 1050 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

472 
WUUS51 KBTV 202332
SVRBTV
NYC031-VTC001-005-007-009-011-015-017-019-021-023-027-210030-
/O.NEW.KBTV.SV.W.0033.210720T2332Z-210721T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Burlington VT
732 PM EDT Tue Jul 20 2021

The National Weather Service in Burlington has issued a

* Severe Thunderstorm Warning for...
  Southeastern Essex County in northern New York...
  Lamoille County in northwestern Vermont...
  Caledonia County in northeastern Vermont...
  Orange County in central Vermont...
  Orleans County in northeastern Vermont...
  Western Essex County in northeastern Vermont...
  Addison County in central Vermont...
  North central Rutland County in southern Vermont...
  Eastern Chittenden County in northwestern Vermont...
  Northwestern Windsor County in southern Vermont...
  Washington County in central Vermont...
  Franklin County in northwestern Vermont...

* Until 830 PM EDT.

* At 730 PM EDT, a line of severe thunderstorms over western Vermont 
  was located along a line extending from near East Franklin to 
  Stowe to East Warren to Mossy Point, moving east at 40 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect wind damage to trees and powerlines. Minor hail 
           damage to vehicles is possible. This line of storms has a 
           history of producing wind damage and power outages.
           

* Locations impacted include...
  Barre, Montpelier, Island Pond, Lyndon, St. Johnsbury, Middlebury,
  Newport City, Vergennes, Crown Point, Morrisville, Enosburg Falls,
  Orleans, Derby Center, Charleston, Braintree Hill, Glover,
  Waterbury Village, Montgomery Center, Websterville and Orwell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4459 7179 4435 7184 4434 7198 4428 7207
      4408 7203 4401 7211 4396 7210 4384 7218
      4379 7358 4450 7299 4501 7300 4501 7184
TIME...MOT...LOC 2330Z 260DEG 34KT 4506 7284 4448 7276 4410 7284 4383
7343

HAIL...1.00IN
WIND...60MPH
 
$$

Evenson/LaRocca

1 follow-up statement

300 
WWUS51 KBTV 210011
SVSBTV

Severe Weather Statement
National Weather Service Burlington VT
811 PM EDT Tue Jul 20 2021

NYC031-VTC001-005-007-009-011-015-017-019-021-023-027-210030-
/O.CON.KBTV.SV.W.0033.000000T0000Z-210721T0030Z/
Essex NY-Lamoille VT-Caledonia VT-Orange VT-Orleans VT-Essex VT-
Addison VT-Rutland VT-Chittenden VT-Windsor VT-Washington VT-
Franklin VT-
811 PM EDT Tue Jul 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR SOUTHEASTERN ESSEX...LAMOILLE...CALEDONIA...ORANGE...ORLEANS...
WESTERN ESSEX...ADDISON...NORTH CENTRAL RUTLAND...EASTERN
CHITTENDEN...NORTHWESTERN WINDSOR...WASHINGTON AND FRANKLIN
COUNTIES...

At 808 PM EDT, a line of severe thunderstorms over northern and 
central Vermont was located along a line extending from near East 
Richford to near Wolcott to Ainsworth State Park to near Pittsfield, 
moving east at 30 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Expect wind damage to trees and powerlines. Minor hail 
         damage to vehicles is possible. These storms have a history 
         of producing wind damage and power outages.

Locations impacted include...
Barre, Montpelier, Island Pond, Lyndon, St. Johnsbury, Middlebury,
Newport City, Vergennes, Crown Point, Morrisville, Enosburg Falls,
Orleans, Derby Center, Charleston, Braintree Hill, Glover, Waterbury
Village, Montgomery Center, Websterville and Orwell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4459 7179 4435 7184 4434 7198 4428 7207
      4408 7203 4401 7211 4396 7210 4384 7218
      4379 7358 4450 7299 4501 7300 4501 7184
TIME...MOT...LOC 0008Z 274DEG 24KT 4506 7262 4458 7237 4409 7258 4381
7288

HAIL...1.00IN
WIND...60MPH
 
$$

Evenson/LaRocca

The office that day

Everything else NWS Burlington, VT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 5:35 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Chittenden	55 min
Jul 20, 6:31 PM EDT	Severe Thunderstorm Warning	BTV	Addison, Chittenden, Franklin, Grand Isle, Lamoille, Rutland and 2 more	59 min
Jul 20, 7:25 PM EDT	Special Weather Statement	BTV	Chittenden	110 min
Jul 20, 3:53 PM EDT	Severe Thunderstorm Warning	BTV	Franklin, St. Lawrence	52 min
Jul 20, 4:44 PM EDT	Severe Thunderstorm Warning	BTV	Franklin, St. Lawrence	61 min
Jul 20, 5:50 PM EDT	Severe Thunderstorm Warning	BTV	Clinton, Essex, Franklin	40 min

Nearby

Severe Thunderstorm Warnings in Vermont, 2021 Severe Thunderstorm Warnings in New York, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.